 /* 整体布局样式 */
 body {
    display: flex;
  }

  * {
  margin: 0;
  padding: 0;
  box-sizing: border - box;
  } 

  .delete{
    background-color:transparent ;
    padding-right:0px;
    padding-top:0px;
    width:30px;
    height:30px;
    float:right;
    font-size:20px;
  }

  .delete:hover{
    background-color: red;
  }

   .answer li{
    font-size:30px;
    color:black;
    text-align:left;
    margin-bottom:20px;
    margin-left: 25px;
  }

  .answer img{
    margin-left:10px;
    width: 100%;
    height:400px;
  }

  .answer p{
    margin-left:10px;
    font-size:30px;
    color:black;
    text-align:left;
    margin-bottom: 20px;
  }
  /* 侧边栏样式 */
  #sidebar {
    width: 200px;
    background-color:#f4f4f4;
    padding: 20px;
    height: 1000px;
    text-align: center;
  }

   #first{
    background-color:rgb(188, 208, 216);
    border-radius: 10px;
   }

  /* 侧边栏列表项样式 */
  #sidebar ul li {
    list-style-type: none;
    padding: 10px;
    cursor: pointer;
  }
  
  /* 内容区域样式 */
  #content {
    flex: 1;
    padding: 10px;
  }

  #item1{
    display: block;
  }

 .feature {
    height: 150px;
    background-color: rgb(188, 208, 216);
    color: white;
    text-align: center;
    width:98%;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    border-radius: 15px;
    display:block;
    margin:auto;
    margin-top:15px;
}

 h1{
   padding-top:40px;
   margin-bottom: 10px;
   font-size:40px;
 }

  /* 内容区域的具体内容样式，默认隐藏 */
  .content-item {
    display: none;
  }